chore: improve debugging for EBUSY errors on Windows (#9976)

Co-authored-by: Nikolay Vitkov <34244704+Lightning00Blade@users.noreply.github.com>

packages/browsers/src/launcher.ts

@@ -291,17 +291,16 @@ class Process {
     ) {
       try {
         if (process.platform === 'win32') {
-          childProcess.exec(
-            `taskkill /pid ${this.#browserProcess.pid} /T /F`,
-            error => {
-              if (error) {
+          try {
+            childProcess.execSync(
+              `taskkill /pid ${this.#browserProcess.pid} /T /F`
+            );
+          } catch (error) {
             // taskkill can fail to kill the process e.g. due to missing permissions.
             // Let's kill the process via Node API. This delays killing of all child
             // processes of `this.proc` until the main Node.js process dies.
             this.#browserProcess.kill();
           }
-            }
-          );
         } else {
           // on linux the process group can be killed with the group id prefixed with
           // a minus sign. The process group id is the group leader's pid.

packages/browsers/test/src/chrome/launcher.spec.ts

@@ -90,11 +90,36 @@ describe('Chrome', () => {
       const process = launch({
         executablePath,
         args: [
+          '--allow-pre-commit-input',
+          '--disable-background-networking',
+          '--disable-background-timer-throttling',
+          '--disable-backgrounding-occluded-windows',
+          '--disable-breakpad',
+          '--disable-client-side-phishing-detection',
+          '--disable-component-extensions-with-background-pages',
+          '--disable-component-update',
+          '--disable-default-apps',
+          '--disable-dev-shm-usage',
+          '--disable-extensions',
+          '--disable-features=Translate,BackForwardCache,AcceptCHFrame,MediaRouter,OptimizationHints,DialMediaRouteProvider',
+          '--disable-hang-monitor',
+          '--disable-ipc-flooding-protection',
+          '--disable-popup-blocking',
+          '--disable-prompt-on-repost',
+          '--disable-renderer-backgrounding',
+          '--disable-sync',
+          '--enable-automation',
+          '--enable-features=NetworkServiceInProcess2',
+          '--export-tagged-pdf',
+          '--force-color-profile=srgb',
           '--headless=new',
-          '--use-mock-keychain',
-          '--disable-features=DialMediaRouteProvider',
+          '--metrics-recording-only',
+          '--no-first-run',
+          '--password-store=basic',
           '--remote-debugging-port=9222',
+          '--use-mock-keychain',
           `--user-data-dir=${path.join(tmpDir, 'profile')}`,
+          'about:blank',
         ],
       });
       const url = await process.waitForLineOutput(CDP_WEBSOCKET_ENDPOINT_REGEX);

packages/browsers/test/src/firefox/launcher.spec.ts

@@ -15,6 +15,7 @@
  */
 
 import assert from 'assert';
+import {execSync} from 'child_process';
 import fs from 'fs';
 import os from 'os';
 import path from 'path';
@@ -26,6 +27,7 @@ import {
   Browser,
   BrowserPlatform,
   Cache,
+  createProfile,
 } from '../../../lib/cjs/main.js';
 import {testFirefoxBuildId} from '../versions.js';
 
@@ -59,10 +61,37 @@ describe('Firefox', () => {
     });
 
     afterEach(() => {
+      try {
         new Cache(tmpDir).clear();
+      } catch (err) {
+        if (os.platform() === 'win32') {
+          console.log(execSync('tasklist').toString('utf-8'));
+        }
+        throw err;
+      }
     });
 
     it('should launch a Firefox browser', async () => {
+      const userDataDir = path.join(tmpDir, 'profile');
+      function getArgs(): string[] {
+        const firefoxArguments = ['--no-remote'];
+        switch (os.platform()) {
+          case 'darwin':
+            firefoxArguments.push('--foreground');
+            break;
+          case 'win32':
+            firefoxArguments.push('--wait-for-browser');
+            break;
+        }
+        firefoxArguments.push('--profile', userDataDir);
+        firefoxArguments.push('--headless');
+        firefoxArguments.push('about:blank');
+        return firefoxArguments;
+      }
+      await createProfile(Browser.FIREFOX, {
+        path: userDataDir,
+        preferences: {},
+      });
       const executablePath = computeExecutablePath({
         cacheDir: tmpDir,
         browser: Browser.FIREFOX,
@@ -70,7 +99,7 @@ describe('Firefox', () => {
       });
       const process = launch({
         executablePath,
-        args: [`--user-data-dir=${path.join(tmpDir, 'profile')}`],
+        args: getArgs(),
       });
       await process.close();
     });